The python3 bin directory no longer needs to be added to PATH.

Bug: 1003139
Change-Id: Iaa288b8b4b2090ac055f53b6b0e116a7874e8bee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3570881Reviewed-by: Chenlin Fan <fancl@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Brian Ryner <bryner@google.com>

vpython3.bat

@@ -3,11 +3,8 @@
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
 
-:: TODO(crbug.com/1003139): Remove.
-:: Add Python 3 to PATH to work around crbug.com/1003139.
 setlocal
 for /f %%i in (%~dp0python3_bin_reldir.txt) do set PYTHON3_BIN_RELDIR=%%i
-set PATH=%~dp0%PYTHON3_BIN_RELDIR%;%~dp0%PYTHON3_BIN_RELDIR%\Scripts;%~dp0%PYTHON3_BIN_RELDIR%\DLLs;%PATH%
 
 call "%~dp0\cipd_bin_setup.bat" > nul 2>&1
 "%~dp0\.cipd_bin\vpython3.exe" -vpython-interpreter "%~dp0\%PYTHON3_BIN_RELDIR%\python3.exe" %*